Refers to the paper-making process will be a gold wire or plastic wire in the middle of the paper. The earliest use of a special metal wire, polyester-based plastic line, micro-letter security line, safety-ray fluorescence, magnetic lines. Safety line shape of straight, wavy, serrated. There is also a safety line laser holographic security thread different viewing angles and color change image, with a windowed security thread, the fifth set of 10 yuan, 5 yuan coupons using the technology.

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